topogen: Don't generate unused config files for Go (#3280)
topogen: Don't generate unused config files for Go (#3280)

path_policy.yml and as.yml are not used by Go services so don't generate them when we use Go only.
netsec-ethz/scion,Oncilla/scion,netsec-ethz/scion,Oncilla/scion,netsec-ethz/scion,Oncilla/scion,netsec-ethz/scion,Oncilla/scion